Yeah PAYE is really really hard and complex. The only countries that do it are Germany and the UK and France (from 2018) and Australia and New Zealand and Ireland and ... etc. etc.
Population of:
USA: 325 million
Germany: 81 million
France: 65 million
UK: 65 million
Australia: 21 million
New Zealand: 4.7 million
This is a tired trope, because this seems to forget that more people also equals more resources to deal with more people. It's not a substantive argument to just say "well there's more of us so this can never work", which is what I assume you're trying to say here.